/Engine/Plugins/Importers/USDImporter/Source/USDExporter/Public/USDConversionBlueprintContext.h
Discards the currently opened stage. This is critical when using this class via scripting: The C++ destructor will not be called when the python object runs out of scope, so we would otherwise keep a strong reference to the stage
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Export context") void Cleanup()